2008-06-27_REPORT - C1980007 (5)

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Upper Raven Gulch Surface Water Quality and Field Parameters C, i 0 5 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL Mountain Coal West Elk Mine Monitoring Location U. Raven Gulch Baseline' 2007 Water Year Description Units Minimum Maximum Mean' 4/26/2007 5/23/2007 Q S 8/24/2007 Field Parameters* Flow m 12409 8653 601 Electrical Conductivity µmhos/cm 131 242 323 H SU 7.67 8.64 8.26 Temperature °C) °C 7.8 6.1 18.2 Temperature °F OF 46.1 43.0 64.8 Comment Laboratory Parameters 3 Name of Certified Lab 2 ACZ Lab Reference # L62831-06 Sample Date 5/23/2007 Lab Test Date 5/25-6/14 Sampled B Alkalinity (Total CaC03) mg/I 57 74 66 95 Aluminum, dissolved m /I -0.03 0.06 0.02 0.08 B Anions me /l 1.3 1.8 1.6 2.3 Arsenic, dissolved m /I Arsenic, total m /I 0.0013 0.0016 0.0015 0.0010 Bicarbonate m /I 57 73 65 95 Boron, dissolved m /1 -0.01 -0.01 -0.01 -0.01 U Cadmium, dissolved m /l -0.005 -0.005 -0.005 -0.005 U Calcium, dissolved m /I 15 19 17 26.4 Carbonate m /I -2 -2 -2 -2 U Cation - Anion Balance m /l -2.9 0.0 -1.5 4.2 Cations me /1 1 2 2 2.5 Chloride m /I -1 1 0 1 B Conductivity µmhos/cm 133 165 149 229 Copper, dissolved m ll -0.01 -0.01 -0.01 -0.01 U Hardness m /I 48 62 55 841 1 Hydroxide m /I -2 -2 -2 -2 U Iron, dissolved m /I 0.04 0.08 0.06 0.04 B Iron, total m /I 8.49 8.89 8.69 21.50 Lead, dissolved m /I -0.04 -0.04 -0.04 -0.04 U Magnesium, dissolved m /I 2.7 3.4 3.1 4.3 Manganese, dissolved m /I -0.005 -0.005 -0.005 0.011 B Manganese, total m /I 0.185 0.193 0.189 0.464 Mercury, total m /I -0.0002 -0.0002 -0.0002 -0.0002 U Molybdenum, dissolved m /l -0.01 -0.01 -0.01 -0.01 U Nitrate as N), dissolved m /I Nitrate/Nitrite as N m /I -0.02 0.02 0.00 -0.02 U Nitrite as N), dissolved m /I H SU 7.8 8.3 8.1 82 H Phosphate m /I 0.09 0.15 0.12 0.24 Phosphorus Ortho , dissolved m /I 0.03 0.05 0.04 0.08 H Potassium, dissolved m /I 0.9 1.0 1.0 1.3 B Selenium, total m/1 -0.001 -0.001 -0.001 -0.001 U Sodium Absorption Ratio SAR calc. 0.52 0.64 0.58 0.85 Sodium, dissolved m /I 8.2 . 11.6 9.9 17.8 Sulfate m /I 10 20 15 20 B TDS Ratio calc. 1.11 1.39 1.25 1.25 TDS Calc. m /I 72 99 86 128 TDS m /I 100 110 105 160 TSS m /I 234 354 294 770 H Zinc, dissolved mg/I -0.01 -0.01 -0.01 0.46 ' Baseline 2005 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels 4 Average (mean) value calc using 1 /2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). C-18 West Elk Mine 2007 Annual Hydrology Report HydroGeo, Inc.